6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <sys/types.h>
29 #include <sys/errno.h>
30 #include <sys/systm.h>
31 #include <sys/atomic.h>
32 #include <sys/kmem.h>
33 #include <sys/machpcb.h>
34 #include <sys/utrap.h>
35 #include <sys/model.h>
36
37 int
38 install_utrap(utrap_entry_t type, utrap_handler_t new_handler,
39 utrap_handler_t *old_handlerp)
40 {
41 struct proc *p = curthread->t_procp;
42 utrap_handler_t *ov, *nv, *pv, *sv, *tmp;
43 caddr32_t nv32;
44 int idx;
45
46 /*
47 * Check trap number.
64 default:
65 return ((int)set_errno(EINVAL));
66 }
67 if (get_udatamodel() == DATAMODEL_LP64)
68 return ((int)set_errno(EINVAL));
69
70 /*
71 * Be sure handler address is word aligned. The uintptr_t casts are
72 * there to prevent warnings when using a certain compiler, and the
73 * temporary 32 bit variable is intended to ensure proper code
74 * generation and avoid a messy quadruple cast.
75 */
76 nv32 = (caddr32_t)(uintptr_t)new_handler;
77 nv = (utrap_handler_t *)(uintptr_t)nv32;
78 if (nv != UTRAP_UTH_NOCHANGE) {
79 if (((uintptr_t)nv) & 0x3)
80 return ((int)set_errno(EINVAL));
81 }
82 /*
83 * Allocate proc space for saving the addresses to these user
84 * trap handlers, which must later be freed. Use casptr to
85 * do this atomically.
86 */
87 if (p->p_utraps == NULL) {
88 pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) *
89 sizeof (utrap_handler_t *), KM_SLEEP);
90 tmp = casptr(&p->p_utraps, NULL, sv);
91 if (tmp != NULL) {
92 kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) *
93 sizeof (utrap_handler_t *));
94 }
95 }
96 ASSERT(p->p_utraps != NULL);
97
98 /*
99 * Use casptr to atomically install the handler.
100 */
101 ov = p->p_utraps[idx];
102 if (new_handler != (utrap_handler_t)UTRAP_UTH_NOCHANGE) {
103 for (;;) {
104 tmp = casptr(&p->p_utraps[idx], ov, nv);
105 if (ov == tmp)
106 break;
107 ov = tmp;
108 }
109 }
110 if (old_handlerp != NULL) {
111 if (suword32(old_handlerp, (uint32_t)(uintptr_t)ov) == -1)
112 return ((int)set_errno(EINVAL));
113 }
114 return (0);
115 }
116
117 void
118 utrap_dup(struct proc *pp, struct proc *cp)
119 {
120 if (pp->p_utraps != NULL) {
121 cp->p_utraps = kmem_alloc((UT_PRECISE_MAXTRAPS+1) *
122 sizeof (utrap_handler_t *), KM_SLEEP);
123 bcopy(pp->p_utraps, cp->p_utraps,
124 (UT_PRECISE_MAXTRAPS+1) * sizeof (utrap_handler_t *));
208 break;
209 default:
210 return ((int)set_errno(EINVAL));
211 }
212
213 if (get_udatamodel() == DATAMODEL_ILP32)
214 return ((int)set_errno(EINVAL));
215
216 /*
217 * Be sure handler address is word aligned.
218 * There are no deferred traps, so ignore them.
219 */
220 nvp = (utrap_handler_t *)new_precise;
221 if (nvp != UTRAP_UTH_NOCHANGE) {
222 if (((uintptr_t)nvp) & 0x3)
223 return ((int)set_errno(EINVAL));
224 }
225
226 /*
227 * Allocate proc space for saving the addresses to these user
228 * trap handlers, which must later be freed. Use casptr to
229 * do this atomically.
230 */
231 if (p->p_utraps == NULL) {
232 pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) *
233 sizeof (utrap_handler_t *), KM_SLEEP);
234 tmp = casptr(&p->p_utraps, NULL, sv);
235 if (tmp != NULL) {
236 kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) *
237 sizeof (utrap_handler_t *));
238 }
239 }
240 ASSERT(p->p_utraps != NULL);
241
242 /*
243 * Use casptr to atomically install the handlers.
244 */
245 ov = p->p_utraps[idx];
246 if (new_precise != (utrap_handler_t)UTH_NOCHANGE) {
247 for (;;) {
248 tmp = casptr(&p->p_utraps[idx], ov, nvp);
249 if (ov == tmp)
250 break;
251 ov = tmp;
252 }
253 }
254 if (old_precise != NULL) {
255 if (suword64(old_precise, (uint64_t)ov) == -1)
256 return ((int)set_errno(EINVAL));
257 }
258 return (0);
259 }
|
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/types.h>
27 #include <sys/errno.h>
28 #include <sys/systm.h>
29 #include <sys/atomic.h>
30 #include <sys/kmem.h>
31 #include <sys/machpcb.h>
32 #include <sys/utrap.h>
33 #include <sys/model.h>
34
35 int
36 install_utrap(utrap_entry_t type, utrap_handler_t new_handler,
37 utrap_handler_t *old_handlerp)
38 {
39 struct proc *p = curthread->t_procp;
40 utrap_handler_t *ov, *nv, *pv, *sv, *tmp;
41 caddr32_t nv32;
42 int idx;
43
44 /*
45 * Check trap number.
62 default:
63 return ((int)set_errno(EINVAL));
64 }
65 if (get_udatamodel() == DATAMODEL_LP64)
66 return ((int)set_errno(EINVAL));
67
68 /*
69 * Be sure handler address is word aligned. The uintptr_t casts are
70 * there to prevent warnings when using a certain compiler, and the
71 * temporary 32 bit variable is intended to ensure proper code
72 * generation and avoid a messy quadruple cast.
73 */
74 nv32 = (caddr32_t)(uintptr_t)new_handler;
75 nv = (utrap_handler_t *)(uintptr_t)nv32;
76 if (nv != UTRAP_UTH_NOCHANGE) {
77 if (((uintptr_t)nv) & 0x3)
78 return ((int)set_errno(EINVAL));
79 }
80 /*
81 * Allocate proc space for saving the addresses to these user
82 * trap handlers, which must later be freed. Use atomic_cas_ptr to
83 * do this atomically.
84 */
85 if (p->p_utraps == NULL) {
86 pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) *
87 sizeof (utrap_handler_t *), KM_SLEEP);
88 tmp = atomic_cas_ptr(&p->p_utraps, NULL, sv);
89 if (tmp != NULL) {
90 kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) *
91 sizeof (utrap_handler_t *));
92 }
93 }
94 ASSERT(p->p_utraps != NULL);
95
96 /*
97 * Use atomic_cas_ptr to atomically install the handler.
98 */
99 ov = p->p_utraps[idx];
100 if (new_handler != (utrap_handler_t)UTRAP_UTH_NOCHANGE) {
101 for (;;) {
102 tmp = atomic_cas_ptr(&p->p_utraps[idx], ov, nv);
103 if (ov == tmp)
104 break;
105 ov = tmp;
106 }
107 }
108 if (old_handlerp != NULL) {
109 if (suword32(old_handlerp, (uint32_t)(uintptr_t)ov) == -1)
110 return ((int)set_errno(EINVAL));
111 }
112 return (0);
113 }
114
115 void
116 utrap_dup(struct proc *pp, struct proc *cp)
117 {
118 if (pp->p_utraps != NULL) {
119 cp->p_utraps = kmem_alloc((UT_PRECISE_MAXTRAPS+1) *
120 sizeof (utrap_handler_t *), KM_SLEEP);
121 bcopy(pp->p_utraps, cp->p_utraps,
122 (UT_PRECISE_MAXTRAPS+1) * sizeof (utrap_handler_t *));
206 break;
207 default:
208 return ((int)set_errno(EINVAL));
209 }
210
211 if (get_udatamodel() == DATAMODEL_ILP32)
212 return ((int)set_errno(EINVAL));
213
214 /*
215 * Be sure handler address is word aligned.
216 * There are no deferred traps, so ignore them.
217 */
218 nvp = (utrap_handler_t *)new_precise;
219 if (nvp != UTRAP_UTH_NOCHANGE) {
220 if (((uintptr_t)nvp) & 0x3)
221 return ((int)set_errno(EINVAL));
222 }
223
224 /*
225 * Allocate proc space for saving the addresses to these user
226 * trap handlers, which must later be freed. Use atomic_cas_ptr to
227 * do this atomically.
228 */
229 if (p->p_utraps == NULL) {
230 pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) *
231 sizeof (utrap_handler_t *), KM_SLEEP);
232 tmp = atomic_cas_ptr(&p->p_utraps, NULL, sv);
233 if (tmp != NULL) {
234 kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) *
235 sizeof (utrap_handler_t *));
236 }
237 }
238 ASSERT(p->p_utraps != NULL);
239
240 /*
241 * Use atomic_cas_ptr to atomically install the handlers.
242 */
243 ov = p->p_utraps[idx];
244 if (new_precise != (utrap_handler_t)UTH_NOCHANGE) {
245 for (;;) {
246 tmp = atomic_cas_ptr(&p->p_utraps[idx], ov, nvp);
247 if (ov == tmp)
248 break;
249 ov = tmp;
250 }
251 }
252 if (old_precise != NULL) {
253 if (suword64(old_precise, (uint64_t)ov) == -1)
254 return ((int)set_errno(EINVAL));
255 }
256 return (0);
257 }
|